Cadillac Series 75 Fleetwood Map Light Bulb Size

The Cadillac Series 75 Fleetwood map light utilizes bulb sizes 90 and 212-2 for interior illumination. Data for the specified components covers the period from 1953 through 1964.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1963-1964	212-2
1962	90
1953-1960	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The bulb 90 is the most frequently specified map light bulb across the Cadillac Series 75 Fleetwood, covering model years 1953-1960 and 1962.
The 90 bulb operates on a 12-volt system and draws 13 watts, using a BA15s single-contact bayonet base, which is a common base type in mid-20th century automotive interior lighting.
The 212-2 bulb is specified for the 1963-1964 model years and is a festoon-type bulb, meaning it is cylindrical and held in place by contact pressure at each end rather than by a base socket.
The 212-2 bulb carries an SV8.5 base designation, which refers to its 8.5mm-wide festoon end caps, and has a 41mm overall length.
The 212-2 operates at 12 volts and 12 watts, placing it slightly lower in wattage than the 90 bulb used in earlier model years.
Both the 90 and 212-2 are ANSI-standardized bulbs recognized in the United States and Canada, meaning they conform to defined electrical and physical specifications rather than being proprietary part numbers.
The two bulb types are not interchangeable. The 90 uses a bayonet-mount socket while the 212-2 is a festoon bulb requiring a clip-style or spring-contact holder, making the mounting hardware incompatible between the two designs.